[CentOS] Kind of OT: internal imap server

>> I probably might have missed them if they exist but are there any for 
>> the helo string and client ip/rdns?
> 
> They are available to milters.  Here's an example of the perl
> you might use in mimedefang:
> http://www.mimedefang.org/node.php?id=18
> 

Oh well, at least that confirms I cannot get the helo string to use 
later with just sendmail rulesets.